Gas-port cooler



March 28, 1939. s. NAISMITH GAS PORT COOLER 2 Sheets-Sheet 1 Filed Dec. 30,1936

INVENTOR.

54MUEL Nfl/EM/TH,

BY-IW I HA6 Arr ggv March 28, 1939. I s. NAISMITH 2,152,491

GAS -PORT COOLER Filed Dec. 50, 1936 2 sheets 'sheet 2 I N V EN TOR. @flMUEL Alma/m Th;

HA5 A TTORNEYS.

Patented Mar. 28, 1939 UNETED STATES PATENT DFFICE 2.152.491 ens-roar COOLER.

Application December 30, 1936, Sena! No. 118,402

1 Claim.

This invention relates to water-cooled coolers for furnace gas-ports, some of the objects being to prolong the life of such coolers, to permit a better arrangement of the refractory material at their front ends or noses, and to facilitate repairs to the linings of furnaces using such coolers.

Two specific examples of an open-hearth furnace gas-port cooler embodying ,the features of the present invention are illustrated by the accompanying drawings, in which:

Figure 1 is a horizontal section of an openhearth furnace using the gas-port cooler.

Figure 2 is a vertical section from the line 11-11 in Figure 1.

Figure 3 is a vertical section from the line III-411 in Figure 2.

Figures 4 and 5 are side and end views of the cooler removed from the furnace.

Figure 6 is an end view of a modification.

The drawings show an end of an open-hearth furnace. This furnace is conventional in that it includes a hearth I, air-chambers 2 opening to this hearth and a gas chamber 3 which also opens to this hearth and over which a refractory arch d is built so as to form a gas-port pointing toward the hearth I. As is usual, this port tapers toward its nose. It will be noted that this port has a backwardly angling front end 5. This feature is conventional, and is of advantage in that it permits a better mixing of the air and gas during the heating cycle.

It is necessary to cool the gas-port, and this is done by the gas-port cooler. This cooler is a hollow-walledmetal arch 6 about which the refractory arch 4, forming the gas-port, is built. This metal arch conforms to the general configuration of the gas-port and is of sumcient length to extend outside of the furnace. It is characterized by having a backwardly angling front end I and internal side bottoms 8 that decline backwardly to sedimenttraps 9 arranged at the back of the cooler and, therefore, outside of the furnace. These traps have wash-out openings or drains to.

One of the advantages of the backwardly angling front end I has already been mentioned in connection with the description of the gas-port. A further advantage is that it permits refractory material to be-built up over its front end, since the angle or slope provides at least some gravitational support for such material. The backward declination of the bottoms 8 is of advantage in that it causes sediment to drift away from the nose or front of the cooler, such sediment ultimately collecting in the traps 8.

The ordinary cooler is of such a construction that sediment tends to collect in its nose, the part which should receive a maximum cooling eflect. It is to be understood that water is circulated within the metal arch, entrances II and exits I! being providedfor this purpose, and that the water used may contain sediment. A further advantage incidental to the declination of the bottoms of the cooler is that this permits these bottoms to extend well down into the walls separating the gas chamber from the air chambers, whereby leakage between the two is more effectively retarded.

Since the back end of the metal arch 6 comprising the cooler extends outside of the furnace, it is possible to easily support this end by the outer furnace framework. The front end of the cooler is supported by a metal beam 13 laid transversely and connecting with the metallic structure or framework of the furnace. All the furnaces of the type under discussion are lined with suitable refractory, indicated at l4, and this beam I3 is entirely independent of such lining. Therefore, when it is necessary to repair this lining, or to replace it, the'metal arch or cooler 6 need not be disturbed, since the removal of the refractory does not remove its support, as has heretofore been the case.

A further feature of the cooler is that it is internally provided with pipes l5 that extend lengthwise and terminate adjacent the bottoms of or near the inside of its nose. These pipes are accessible from the back of the cooler and may be connected to a supply of water under high pressure so as to provide a means for flushing sediment from the front of the cooler back down alons the bottoms 8 to the traps 9. The drains ll) of the traps 9 may be provided with valves and connected directly to a sewer to facilitate such a flushing operation.

In the case of the modification, the separate traps 9 communicating with each of the bottoms 8 are substituted by a single trap 9' that extends the width of the cooler and connects with both of the bottoms 8. This trap is provided with a single drain ill. The cooler is otherwise the same.

I claim: I

A furnace including a gas chamber opening upwardly to a. heating zone, a refractory arch built over the opening of said chamber to form a gasport having a backwardly angling front end pointing toward said zone, a hollow-walled metal arch inside said refractory arch and extending from the front of the latter back to a location outside of said furnace. a refractory lining for said furnace and means for supportingsaid metal arch independently of said refractory arch and lining, said metal arch having a backwardly angling front end and internal side bottoms that decline backwardly and are provided with downwardly extending sediment trapping means located exteriorly of the furnace brickwork andlhavlng drain openings, the hollow wall of said metal arch having an inlet and an outlet for cooling water.

SAIIUHINAIBMITB. 

